61947259223077 has 2 divisors, whose sum is σ = 61947259223078. Its totient is φ = 61947259223076.

The previous prime is 61947259223023. The next prime is 61947259223123. The reversal of 61947259223077 is 77032295274916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55643976141121 + 6303283081956 = 7459489^2 + 2510634^2 .

It is a cyclic number.

It is not a de Polignac number, because 61947259223077 - 2¹⁵ = 61947259190309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61947259233077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30973629611538 + 30973629611539.

It is an arithmetic number, because the mean of its divisors is an integer number (30973629611539).

Almost surely, 2^{61947259223077} is an apocalyptic number.

It is an amenable number.

61947259223077 is a deficient number, since it is larger than the sum of its proper divisors (1).

61947259223077 is an equidigital number, since it uses as much as digits as its factorization.

61947259223077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80015040, while the sum is 64.

The spelling of 61947259223077 in words is "sixty-one trillion, nine hundred forty-seven billion, two hundred fifty-nine million, two hundred twenty-three thousand, seventy-seven".